According to Roach, Morrow had been "free-lancing around San Francisco clubs" when they hired him to play with them after having rejecting two other bassists.[3] He appeared on all of the studio albums made the Clifford Brown-Max Roach Quintet. After that band dissolved due to the deaths of Brown and Richie Powell in a car accident, Morrow continued recording with Max Roach's band. He also worked with Anita O'Day in the 1970s before joining the Disney World house band in 1976.